How to Make It

Step 1

Preheat the oven to 400°. In a bowl, mix half of the lime zest, lime juice, garlic and chile. Stir in the olive oil. Make 3 shallow 2-inch slashes into the skin of each fish fillet. Spread the garlic-chile paste over the fish. Transfer the fish to a baking dish, skin side up; season with salt and pepper. Bake for 8 minutes, until the fish flakes easily.

Step 2

Meanwhile, in another small bowl, combine the mayonnaise with the capers and the remaining lime zest, lime juice, garlic and chile. Season the sauce with salt and pepper.

Step 3

Toast the buns. Spread the sauce on the buns and top with the fish, lettuce and onion. Close the sandwiches and serve.